Topics

The rate at which the amplitude of rail vibration decays in longitudinal direction of the rail. Alongside rail roughness, this is one of the most important parameters influencing the level of rolling noise. The…

The profile of the rail head is continually restored by grinding. In addition to reprofiling grinding, there is also the acoustic grinding process, which results in low surface roughness on the rail running…

Minor irregularities on the rail running surface which cause the wheel and rail to vibrate. The rougher the rail running surface, the greater the rolling noise.

A sub-field of acoustics and railway acoustics focusing on rail vehicles. It comprises the sub-fields of sound sources (origin of rolling noise, components), sound propagation within and from structures typical of…

A branch of acoustics focusing on noise generation in railway vehicles and infrastructure. This includes, among other things, noise generation in rail vehicles (rail vehicle acoustics) as well as the influence of…

Railway noise refers to the noise generated by trains and trams in the neighbourhood.

Determining the range of local networks such as Wi-Fi or Bluetooth using objective measurement methods and grid surveys. 

For the design of exhaust gas cleaning systems. 

An acoustic surface wave is a structure-borne sound wave that propagates in a plane on a surface, i.e. in only two dimensions.

In emission measurements, a reference method refers to a procedure established by convention and described in standards, regulations or guidelines for determining pollutant concentrations in exhaust gases or other…

Number of images displayed per second.

The number of frames per second, which is important for smooth motion, particularly in gaming.

This regulation specifies the nature and scope of the necessary noise control measures for rooms requiring protection within buildings, insofar as the permissible emission limit values for the operation of…

Regulations governing the domestic and cross-border transport of dangerous goods by road, rail and inland waterway.

Installations are classified as relevant to major accidents if, due to the nature, quantity and handling of hazardous substances, there is a risk of major accidents that could have significant consequences for human…

At the representative measuring point, the local mass flow density of a measurement component corresponds to the mass flow density averaged over the entire measurement cross-section. 

The required containment capacity for spilled water-polluting substances is regulated in § 18(3) and (4), § 21(1) of the AwSV, and in Chapter 3, Section 3 of the AwSV.

Indicates the number of pixels in an image or display and affects the level of detail.

The time it takes for a pixel to change from one state to another. A fast response time is important for smooth motion, particularly in games and videos. 

ReSyMeSa stands for ‘Recherchesystem Messstellen und Sachverständige‘ (Search System for Monitoring Stations and Experts). It is a system established in Germany to improve efficiency and transparency in the…

A diffuse sound field in which the same sound pressure level is present at every point throughout the room.

The systematic identification of potential hazards and the subsequent determination of measures to prevent these hazards or mitigate their effects.

The responsibility for carrying out a risk assessment, including for noise and vibrations at the workplace, lies with the employer. The employer must, among other things, determine whether employees are exposed to,…

The Occupational Safety and Health Act requires employers to assess working conditions and, in doing so, to identify hazards. They must evaluate the risks to employees, devise appropriate measures, verify their…

Guideline on Road Noise Protection. It describes the emission characteristics of road traffic noise and sets out noise reduction values for various road surface layers.

Carrying out mathematical forecasts for rail and road traffic, including proposals for implementation and, where necessary, assessing the suitability of measures on the basis of risk analyses. …

Measurement of inhalation exposure: bitumen fumes. 

Road traffic noise refers to the noise in the neighbourhood generated by road traffic. According to relevant studies, road traffic noise causes the highest levels of noise pollution in Germany. …

Rolling noise is a major source of rail traffic noise. It is caused by the wheels rolling along the rails. Unevenness in the contact surfaces between the wheel and the rail causes both to vibrate, and this vibration…

Subjective perception of the roughness of a sound; unit: Asper; rapid amplitude modulations at approximately 30 to 100 Hz.